EUGENE - A trio of freshmen keyed the No. 4 University of Oregon softball team (44-7, 17-3) to its second-biggest winning margin in the last 30 years of Civil War play vs. Oregon State (32-19, 7-13).

Saturday afternoon's 11-0, five-inning victory trailed only its 13-0 margin in 1991, and the Ducks' run output was its third-best vs. OSU since the start of NCAA play in 1982 behind a 12-3 victory in 1991.

"Sometimes it takes a little spark to really get the fire going," Oregon head coach Mike White said. "The bases loaded walk to Janelle was big and really broke the ice. Cheridan pitched another two-hitter and did a lot of great things, too."

In front of a sellout Howe Field crowd of 1,298, Duck pitchers combined on their 13th shutout of the season, and the offense also scored in double digits for the 13th time in '13.

In the circle, freshman Cheridan Hawkins (17-4) struck out nine in four innings, walked only one, and allowed four hits.

"Alexa and I were able to mix up our pitches really well," Hawkins said, "and we took it one pitch at a time. Today was a big win, and it was really exciting to come through for the team."

Sophomore Karissa Hovinga finished her 14th game of the season. In her final inning of work, the Ralston, Neb., native struck out one, walked one, and yielded two hits.

In the third inning, freshman DP Janelle Lindvall posted her fourth game-winning RBI of the season with a bases-loaded walk off starter Sarah Shadinger (2-3).

Freshman third baseman Koral Costa followed with her fourth homer of the year and first career grand slam to left field in the five-run inning.

"I hit one really far yesterday, but it went foul, so it was nice to get one that counted," Costa said. "Coach told us beforehand that we needed to score early and be smart at the plate. The noise and huge crowd were great, and really helped kickstart the the team."

Demore retired the final two outs, struck out one, walked two, yielded two hits and four earned runs.

With Saturday's outcome, the Pac-12-leading Ducks guaranteed themselves of taking their seventh Pac-12 series in as many tries this year after winning Friday's opener, 2-1.

Looking ahead to the Ducks' regular season home finale, the two teams meet on Sunday at 1 p.m., with action again broadcast live by the Pac-12 TV Network.

For Sunday's Senior Day promotion, senior citizens and kids will get $2 tickets, and 100 free Oregon Softball t-shirts will be given away. Kids can run the bases post-game, and Duck students get double points for the Oregon Rewards program.

BOXSCOREOregon State at #4 Oregon May 04, 2013 at Eugene, Ore. (Howe Field)